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  • Which among the following is(are) double displacement reaction(s)?

Which among the following is(are) double displacement reaction(s)?

(i) Pb + CuCl_2 \rightarrow PbCl_2 + Cu

(ii) Na_2SO_4 + BaCl_2\rightarrow BaSO_4 + 2NaCl

(iii) C + O_2\rightarrow CO_2

(iv) CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O

(a) (i) and (iv)        (b) (ii) only

(c) (i) and (ii)        (d) (iii) and (iv)

Answers (1)

Ans. (b)

Double displacement reactions are those in which ions of the reactants are exchanged to form new compounds as products.

Na+ ion combines with Cl^ - ion and SO_{4}^{2-} ion combines with Ba^{2+} ion to form two new compounds as sodium chloride (NaCl) and barium sulphate (BaSO_4)respectively.

Sodium and Barium are displaced from each other’s salts hence it is a double displacement reaction.

 

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